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CLACKAMAS, Ore. (KOIN 6) — The main suspect in the execution-style killing of a Clackamas County weighmaster in February was likely spotted in the Des Moines, Iowa area in early April.

The Clackamas County Sheriff’s Office released information Wednesday that on April 5, a man fitting the description of suspect Dirck Morgan White was seen firing a gun from a Mercedes on Highway 330 near Des Moines.

Authorities want to speak with the person who called 911 about the incident.

White, 41, is considered armed and dangerous. He’s nearly 6 feet tall, weighs about 190 pounds and has black hair and brown eyes.

Grady Waxenfelter, a weightmaster for Clackamas County, was gunned down on Highway 224 by a truck driver, Feb. 6, 2014 (Courtesy photo)

It’s believed he gunned down weighmaster Grady Waxenfelter during a traffic stop near Boring on Feb. 6. Waxenfelter pulled over a commercial truck White was driving because the truck did not have a license plate.

Waxenfelter, a 47-year-old married father of three, was shot in the head and died at the scene.

At that time, White was wanted in Pierce County, Washington on weapons charges, and is also wanted for questioning in a child rape case.

White is believed to have been driving a a silver 2004 Mercedes 320 four-door sedan with Washington license plate ANB7070.

A murder warrant was issued against White and a nationwide search is underway. A $16,000 reward is offered for information leading to his arrest and conviction.